
<style>
  #f78b5e9ab::part(progress) { height: calc((var(--stroke-width) * 1) * 1px); background-color: gray; }
  #f78b5e9ab::part(determinate) { height: calc((var(--stroke-width) * 3) * 1px);background-color: red; }
</style>
<fluent-progress id="xxx" min="0" max="100" value="30" blazor:elementreference="xxx"></fluent-progress>